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Sounds a bit complecated does the internet run ok in the mac ok? Has it worked with windows before?
Have you got a straight connection other than airport like a dialup or something similar just to test with windows just an idea.Does windows see airport ok, talk to apple look on the apple forum talk to parallels.
Getting internet to work is a pain at the moment lets hope an update fixes this issue!
Have you tried both Shared and Bridged networking?
After the update did the new tools install ok? Have you reinstalled them?
Have you followed the steps on the knowledgebass article? http://kb.parallels.com/en/8978